Pulse actuated solenoid for broken thread detector

ABSTRACT

Method and apparatus wherein a solenoid actuated armature moves a latch out of latching engagement with a member which is biased to move when so released; in which the solenoid is energized by a series of current pulses rather than by a continuous supply of current and movement of the latch to release position interrupts the circuit to said solenoid while a counter counts the pulses to the solenoid and interrupts the circuit thereto when a certain number of pulses have been supplied to the solenoid, and while a signal lamp is illuminated whenever the latch moves to release position or whenever the counter interrupts the circuit to said solenoid.

United States Patent 1,308,249 7/1919 MacGahan, 1,455,795 5/1923 Logan 1,995,636 3/1935 2,812,513 11/1957 Breggin......,.............,... 2,941,195 6/1960 McNair 3,013,258 12/1961 Tech et a1.

1/1962 Glover et a1. Primary Examiner-John W. Caldwell Assistant Examiner-Perry Palan Attorney-Walter Becker Inventor Willy Heimes Kreleld, Germany Appl. No. 670,541

Filed Sept. 26, 1967 [4S] Patented July 20, 1971 Assignee Palitex Project Company GmbH Kreield, Germany Priority Dec. 22, 1966 1 1 [33] Germany 1 1 P 41.070

1 54] PULSE ACTUATED SOLENOID FOR BROKEN THREAD DETECTOR 2 (3m 3 Dnwing 8i ABSTRACT: Method and apparatus wherein a solenoid actufitted armature moves a latch out of latching engagement with {52] a member which is biased to move when so released; in which the solenoid is energized by a series of current pulses rather 340/2671 340/259 ......G08b2l/00 [50] Field than by a continuous supply of current and movement of the latch to release position interrupts the circuit to said solenoid while a counter counts the pulses to the solenoid and interrupts the circuit thereto when a certain number of pulses have been supplied to the solenoid, and while a signal lamp is illuminated whenever the latch moves to release position or S T m mm C m% T A nT ms w n N U m 340/267 whenever the counter interrupts the circuit to said solenoid.

1,289,955 12/1918 Swift...,.............

PATENTEU JUL2 0 l97| SHEET 2 OF 2 lWMFA/mi? PULSE ACTUATED SOLENOID FOR BROKEN THREAD DETECTOR The present invention relates to a method and arrangement for axially engaging and disengaging the magnetic core of a magnetic coil for initiating the control movement of a control member for textile machines.

With numerous types of machines employed in the textile industry, especially with spooling, spinning or twisting machines, adjusting movements of individual adjusting elements are released by engaging or disengaging the magnetic core of a magnetic coil, and this movement becomes effective on a control member in one or the other direction directly for through the intervention ofintermediate elements.

According to one suggestion employing the above mentioned method of releasing adjusting movements, the axial displacement of the magnetic core of a magnetic coil frees a cam I body adapted to turn by means of a spring force. This cam body when freed carries out a rotative movement by means of which a braking pin forming the shaft of the cam body is subjected to a corresponding turning movement. The said braking pin has a polygonal end i by means of which it engages the spreading gap between the brakeshoes of a spindle brake designed as inner shoe brake so that in view of the turning movement the brake shoes spread apart and engage the braking surface of the spindle.

According to another heretofore made suggestion, the tilting arm of a thread catching head is mounted on the rotary shaft of the cam body, and the said tilting arm will when being tilted hold the thread, for instance on its way from the delivery bobbin to the hollow spindle shank of a two-for-one twisting spindle in order to prevent a further withdrawal of the thread from the delivery bobbin.

In both instances, the thread regulator is adapted to release the reaction of the magnetic coil which in its turn brings about the axial displacement of the magnetic core whereby the cam body is freed for carrying out its tilting movement.

As a rule, the conditions are such that the magnetic core similar to the above mentioned heretofore suggestions brings some interengaging cams out of engagement. Since these cams are in frictional engagement with each other, the magnetic core when being axially displaced in one or the other direction into the magnetic coil or out of the same has to overcome the said force of friction. This force of friction may, however, be relatively high so that the magnetic coil requires corresponding dimensions. If only small magnetic coils are employed which is desirable in view of the space conditions and for reasons of cost, the duration of the admissible current load is limited. if, however, a permanent current is available, such current may in view of the limited size of the magnetic coil being about an overload or in view of the low current selected because of the magnetic coil will be insufficient to release the adjusting movement of the magnetic core while overcoming the frictional forces. Consequently, the desired adjusting movement does not occur and the parts to be detached from each other remain in engagement with each other.

It is, therefore, an object of the present invention to provide a method and arrangement for axially engaging and disengaging the magnetic core of a magnetic coil for the above mentioned purpose, which will overcome the drawbacks outlined above.

It is a further object of this invention to provide a method and arrangement as set forth in the preceding paragraph which will prevent the danger of an overload of the magnetic coil.

These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawings, in which:

FIG. I is an isometric view of a magnetic core releasing adjusting member for actuating a spindle brake with inner brake shoes.

FIG. 2 is an isometric view of the same adjusting device for actuating a thread catching device.

FIG. 3 is a circuit for the arrangements of FIGS. I and 2.

The method according to the present invention for axially engaging and disengaging the magnetic core ofa magnetic coil the movement ofwhich in one or the other direction is directly or by intermediate means adapted to bring about the adjusting movement ofa control element on textile machines, especially spooling, spinning or twisting machines, is characterized primarily in that the magnetic coil instead of being fed with permanent current or current of a continuous flow is being fed with current impulses, and the current supply is by the release of the adjusting movement of the control member turned off automatically. By current impulses is meant the feeding of a current of any desired type which during the period during which it gives off current is by means of a time pulsing switch automatically interrupted several times. Thus it is realized that the magnetic coil is placed under load only for short periods with interruptions, and the load is effective only until the displacement armature has been displaced and thus the adjusting movement of the control member has been initiated. The low load of the magnetic coil will also avoid overheating of the magnetic coil. This is a particular advantage which is of special importance in connection with textile machines.

A further advantage inherent to the present invention consists in that the current impulses bring about shocklike advancing movements of the magnetic core in the rhythm of the current impulses which contribute to overcoming the friction between the interconnecting parts so that the disengagement of such elements from each other is considerably facilitated. According to a further development of the invention, the axial displacement of the magnetic core may be effected by the said current impulses against the thrust of a spring whereby it will be assured that the magnetic coil will be fed with current impulses only for the working operation but will automatically be returned to its starting position by the thrust of the spring. The feeding of the magnetic coil with current impulses leads to the possibility of providing a further simple safety measure if against expectation, also when employing current impulses and the shocklike movements initiated thereby, the frictional forces which act counter to the releasing operation have not been overcome. To this end itmay be provided according to the invention that the current supply is automatically turned off after a predetermined number of current impulses in case the adjusting movement of the control member is not released. The turning off of the current supply causes the simultaneous lighting up of a signal lamp to signal the operator to check the control member.

Referring now to the drawings in detail, FIGS. 1 and 2 show two similar devices in connection with which the method according to the invention may be practiced. The device comprises a base or mounting plate I through which extends a rotatable shaft 2. One end 3 of said shaft 2 has mounted thereon a cam body 4 which rests on the plate l and is nonrotatable with regard to the shaft 2. According to FIG. 1, the free end 5 of the rotatable shaft 2 which end is reduced by two surfaces which are parallel to each other extends between the two brakeshoes 6 of the inner brakeshoe of the brake of a spindle 7 indicated in dot-dash lines. When the shaft 2 is rotated by approximately the brakeshoes 6 are spread apart radially and then in a customary manner engage the braking surface of the spindle 7 so that the latter will come to a stop. For purposes of returning the rotary shaft 2 to its starting position according to FIG. 1, the rotary shaft 2 has connected thereto a manually operable lever 8.

The spindle 7 is in a nonillustrated manner journaled in the spindle rail 9 indicated by dot-dash lines through which shaft 2 extends. The mounting plate l of shaft 2 is connected on the rail below the spindle rail 9.

In contrast to the arrangement of FIG. ll, according to FIG. 2 the mounting plate I is placed on a rail it) so that the rotary shaft 2 has its free ends extend downwardly through the rail I0. The outer end has connected thereto the tilting arm ll of the head 12 which is adapted to be tilted by approximately 90 in order to reach its effective position.

According to FIGS. 1 and 2, the cam 13 of the cam body 4 is engaged by the counter cam 14 of the twoarm pawl yoke 15. Yoke 15 is pivotable about a pivot l6 which in its turn is connected to the mounting plate I. The free end of arm 17 has linked thereto a magnetic core 18 which is pulled out of the magnetic coil 19. The free end of the magnetic core 18 is forkshaped while the prongs 20 extend above and below the yoke arm 17. The link connection is established by a pin which extends through a longitudinal slOt 21 in vertical direction, said pin interconnecting the fork prongs 20. The other yoke arm 22 of the yoke 15 is engaged by the leaf spring 23 forming a part of a cutoff key or circuit breaker. The leaf spring 23 holds the yoke 15 in the illustrated position in which the magnetic core 18 is pulled out of the magnetic coil 19 so that the counter cam 14 engages the cam 13 of the cam body 4. One end of the coil spring 25 is connected eccentrically to the cam body 4 at 24, whereas the other end of said coil spring 25 is connected to the upwardly bent ear 26 of the mounting plate 1. The tension spring 25 has the tendency to turn the cam body 4 in counterclockwise direction but is prevented from doing so because the cam 13 engages the countercam 14.

The rotary movement of the cam body 4 is brought about by the fact that the magnetic coil 19 is fed with current impulses. These current impulses tend to pull the magnetic core 18 into the magnetic coil 19 while the current impulses bring about shocklike movements on the magnetic core 18. Thus, the countercam 14 will, in view of the tilting of yoke 15, by means of the magnetic core 18 engaging the same, be disengaged from the cam 13 of the cam body 4 so that the tension spring 25 becomes effective on the cam body 4 and turns the same until it abuts the upwardly bent ear 28 of the mounting plate 1 by means ofthe cam 27.

According to FIG. 1, also the rotary shaft 2 is subjected to a rotary movement by means of which the braking of the spindle 7 is brought about, whereas according to FIG. 2-the rotary movement of the rotary shaft 2 causes the tilting arm 11 with the head 12 to tilt by about 90. The drawing in of the magnetic core 18 into the magnetic coil 19 while the yoke 15 is tilted is effected counter to the force of the leaf spring 23 as a part of a separating switch generally designated 29 which in view of the tilting movement of arm 22 of yoke 15 interrupts the current supply, namely the current impulses to the magnetic coil 19 but at the same time closes a circuit causing the signal lamp 30 to light up.

The wire connections of switch 29 with the signal lamp 30 and the magnetic coil 19 are evident from FIGS. 1 and 2 and are additionally diagrammatically shown in FIG. 3. FIGS. 1 and 2 also illustrate the terminal strip 31 which is connected to the mounting plate 1. Connected to the terminal strip are the wires which establish the connection with the automatically operating impulse transmitter 32 (shown in FIG. 3) for producing the current impulses.

FIG. 2 illustrates in dot-dash lines a hood 33 by means of which the device is protected against dust and soil. A corresponding hood may also with the embodiment of FIG. I be placed from the bottom against the spindle rail 9.

FIG. 3 illustrates in detail and diagrammatically the electric circuit. Interposed into one connection between the impulse transmitter 32 and the magnetic coil 19 is the frame switch 34 which, for instance with a two-for-one twisting machine, is adapted to interrupt the connection by lifting off the windingup bobbin from the friction roller whereby any control moveir nt is made impossible. If, however, switch 34 is closed, it will be appreciated that in the instance of a thread break, switch 35 will be closed automatically, or the parallelly arranged switch 36 will close which then closes the circuit when the winding-up bobbin has reached a certain diameter. From the parallel arrangement it will be evident that either one switch or the other switch is able to close the circuit of the magnetic coil 19.

The diagram also clearly shows the working of the switch 29 which by pulling in the magnetic core 18 into the magnetic coil 19 interrupts the circuit of the magnetic coil 19 and simultaneously closes the circuit for the signal lamp 30 which this will light up.

By a counter in the circuit, shown diagrammatically at 40, it is also possible to operate a predetermined count switch 42 in the circuit of the magnetic coil 19 which switch will be adapted, after a predetermined adjusted number of current impulses, automatically to open and to cause the signal lamp 30 to light up similar to the switch 29 so that an operator will optically realize that the spindle pertaining to the signal lamp has to be serviced.

It is, of course, to be understood that the present invention is, by no means, limited to the particular method and arrangement as set forth above but also comprises any modifications within the scope of the appended claims.

What I claim is:

I. A regulating device for a textile machine having a yarn control device, said device comprising a spring biased member, a latch element engaging said spring biased member to prevent movement of said member by spring action, a solenoid coil having a magnetic core to move said latch element to release said spring biased member, a current impulse emitter in circuit with said solenoid coil to supply successive current impulses to said coil to actuate said magnetic core and move said latch element, and a machine controlled switch in said circuit to close said circuit and transmit said current impulses to said solenoid coil, so that said current impulses will act intermittently to move said latch element without excessive total current to said coil, and a switch in said circuit opened by operation of said latch element to open said circuit to said coil.

2. A regulating device as in claim I, and an impulse counter controlled switch in circuit with said solenoid coil, said impulse counter opening said counter controlled switch after a predetermined number of impulses. 

1. A regulating device for a textile machine having a yarn control device, said device comprising a spring biased member, a latch element engaging said spring biased member to prevent movement of said member by spring action, a solenoid coil having a magnetic core to move said latch element to release said spring biased member, a current impulse emitter in circuit with said solenoid coil to supply successive current impulses to said coil to actuate said magnetic core and move said latch element, and a machine controlled switch in said circuit to close said circuit and transmit said current impulses to said solenoid coil, so that said current impulses will act intermittently to move said latch element without excessive total current to said coil, and a switch in said circuit opened by operation of said latch element to open said circuit to said coil.
 2. A regulating device as in claim 1, and an impulse counter controlled switch in circuit with said solenoid coil, said impulse counter opening said counter controlled switch after a predetermined number of impulses. 